Method of producting nickel iron powder



r amed A r. 7 42' f a o 2.279.013.

manufacture ot so -called dust-cores for loador'oxide-as the case, may be to iron, and at the provision oi" a simple, and emcie'nt ,process for crushed to powdenwhen particles approximating conveniently manufacturing -such powder of any tothe desired size will be obtained. It moreacdesired composition and particle size.

nickel iron powder of predetermined particle size, of predetermined particle size in which nickel nickel powder having particles of approximately powder having particles of approidmatelypthe-j crushed to powder. to powder.

I crushed to powder. of 600-1200 0., in a reducing atmosphere and in proportions depending on the amount of iron powder having particles of approximately the pre- UNITED STATES PATENTOF-l ICE nm'rnon or rnonucmc moxnr. mom rownna Philip Norton Roseby, Woodvale, near Southport, England, assignor to Automatic Telephone & Electric Company Limited, London, England, a British company 1 No Drawing. Application May 20,1941, Serial No. 394,391. ,In GreatBritain June 25, 1940 .l 3 Claima. (or 754.5)

The present invention relates to the production electric turnace, in the presence ci a reducing of nickel-iron powder such as finds, use for the i such-as hydrogen so as to reduce the iron oxalate ing coils, filter inductancesghigh frequency trans-- same time to alloy it-with the nickel. The resultformers and the like an'd'ithas, io'rits objectvthe .5 'ant sintered mass of nickel-iron may then be re- 7 v v curately dimensioned'particles are required the Nickel powder is readily obtainable commerpowder may be subjected to grindingin'a ball mill cially in various grades of particle. size prepared 10 in known manner. v for instance by the carbonyl process and it has The invention therefore provides a simpleaand been found that if such nickel powder is employed convenient method of obtaining nickel-iron powas the starting material, the-size oi the particles der of any required composition and particle size has an important bearing on the size of theparfrom materials which are readily available} tlcleS --0f the alloy which are most'readily 011- What I claim as new and desire to secure-byrained. h u I r 7 Letters Patent is:

According to the invention in order to .produce 1. A method of producing nickel-iron powder the predetermined size is mixed with an appro- 0 p edete m eds e is mixed wi h an appropriate." priateproportion of an iron; compound readily proportion of an iron compound readily capable capableoi reduction which is in the form ,0! par- 7 of reduction which is in the form of particles r ticles considerably smaller than the particles of considerably smaller than the particles of nickel; nickel, the mixture being heated in, a reducing the mixture beingv heated in a reducing atmos atmosphere and the sintered mass subsequently 2 phere and the sinteredmass subsequently crushed v According to another feature of the invention, 2. A method of producing nickel-iron powder in order to produce powder of predetermined parof predetermined particle size in which nickel ticlesize nickel powder having particles 01' appowder having particles of approximately the proximatelyithe predetermined size is mixed with 0 predetermined size is mixed with an appropriate arr appropriate proportion of iron oxalateor iron proportion of iron oxide in the i'orm of particles oxide',"heated to ,a temperature of 600-1200 C. considerably smaller than the particles of nickel, in a reducing atmosphere and subsequently the mixture being then heated to a'temperature in a-preferrediorm of carrying the invention subsequently crushed to powder. into effect, nickel powder of the appropriate pare 3. .A method of producing nickel-iron powder ticle size is mixed with iron oxide or iron oxalate ofpredetermined particle size in which nickel required in the final alloy, the iron oxide or iron determined size is mixed with an appropriate oxalate preferably having a particle size much 40 proportion of iron oxalate in the form of parsmaller than that of the nickel powder. During ticles considerably smaller than the particles of the mixing the-particles or nickel powder become nickel, the mixture being then heated to a temcoated with the finer particles of the iron oxalate perature of 600-1200 C. in a reducing atmosor iron oxide. The mixture is then heated to a phere and subsequently crushed to powder. temperature 01' BOW-1200, 0., preferably in an PHILIP NORTON ROS EBY. 

